Those 0 energy homes which don't cost a lot to heat are impossible to live in, in the summer.
Once the heat gets inside you can't get it out unless you use airconditioning which costs more than heating.
Experts warn the Government-sponsored drive to construct ever-more ‘green’ homes has created an unforeseen, but potentially lethal, problem.
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Researchers from Coventry University tracked temperatures inside eco-homes and found that 72 per cent failed their design criteria and heated up to more than 25C.
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